56556534551 has 4 divisors (see below), whose sum is σ = 61698037704. Its totient is φ = 51415031400.

The previous prime is 56556534533. The next prime is 56556534553. The reversal of 56556534551 is 15543565565.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56556534551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56556534551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56556534553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570751560 + ... + 2570751581.

It is an arithmetic number, because the mean of its divisors is an integer number (15424509426).

Almost surely, 2^56556534551 is an apocalyptic number.

56556534551 is a deficient number, since it is larger than the sum of its proper divisors (5141503153).

56556534551 is a wasteful number, since it uses less digits than its factorization.

56556534551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141503152.

The product of its digits is 6750000, while the sum is 50.

The spelling of 56556534551 in words is "fifty-six billion, five hundred fifty-six million, five hundred thirty-four thousand, five hundred fifty-one".